A Robust Cooperative Distributed Secondary Control Strategy for DC Microgrids With Fewer Communication Requirements

This article proposes a robust cooperative distributed secondary control strategy for dc microgrids, with the main focus on reducing communication burdens. To this end, we adopt a sparsity-promoting consensus-based distributed secondary control framework for converter-interfaced dc microgrids consisting of multiple distributed generation (DG) units. The proposed control strategy relies on less (sparse) information exchange over a communication network and does not require exchanging voltage signals or their estimated values amongst neighboring DG units. Rigorous Lyapunov-based stability certificates for dc microgrids are derived. The stability conditions can be verified without the knowledge of distribution lines connecting different DG units. The effectiveness of the proposed secondary control approach is verified by experimental results and a comparative simulation case study on a multiple-DG dc microgrid.

Automated summary

This article proposes a robust cooperative distributed secondary control strategy for dc microgrids, with a focus on reducing communication burdens. The strategy adopts a sparsity-promoting consensus-based framework and does not require exchanging full voltage signals between neighboring units. Rigorous stability certificates are derived, which can be verified without knowledge of the connecting lines. Experimental results and simulation studies verify the effectiveness of the proposed approach.